Using update-alternatives when deploying two versions of Qt on OpenSuse Linux

I have version of Qt installed from repositories of OpenSuse Linux. But it lacks some of the Qt components and I needed to install SDK.
When you install two versions of Qt on Linux you need to tell the system which compiler to use.
I used the following command to add newer qmake as alternative to preinstalled qmake: "sudo update-alternatives --install /usr/bin/qmake qmake /opt/QtSDK/Desktop/Qt/4.8.1/gcc/bin/qmake 10"
Command output:
"Update-alternatives: warning: /etc/alternatives/qmake has been changed (manually or by a script). Switching to manual updates only.
Update-alternatives: using /opt/QtSDK/Desktop/Qt/4.8.1/gcc/bin/qmake to provide /usr/bin/qmake (qmake) in auto mode.
update-alternatives: warning: not replacing /usr/bin/qmake with a link"

I also get strange output from command: "sudo update-alternatives --config qmake"

"There is only one alternative in link group qmake: /opt/QtSDK/Desktop/Qt/4.8.1/gcc/bin/qmake
Nothing to configure.
update-alternatives: warning: forcing reinstallation of alternative /opt/QtSDK/Desktop/Qt/4.8.1/gcc/bin/qmake because link group qmake is broken.
update-alternatives: warning: not replacing /usr/bin/qmake with a link"

That's the point where I got stuck would like to ask for a help if somebody knows the question.